To dream of yeast shows that what your next undertake will prosper, that your wife will soon be in the family way. If a single man your sweethearts love will increase. To a maiden, her lover will be rich, and, very likely, a brewer or baker. To dream that they are kneading dough with yeast, is a sure sign of being comfortable for life.
Read more about dreaming of Yeast in other dream meanings interpretations.